Malicious PDF — malware analysis report

Static analysis result for SHA-256 6471508286a4010c…

MALICIOUS

PDF

83.9 KB Created: 2021-07-21 13:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0882dc7576ddbb608b95568e8ec8b5c2 SHA-1: 91777bd16e19bc90dc03d8b9bc6fdeba36b66ea2 SHA-256: 6471508286a4010cf64d03205a32aa6e54464b20bdc20cc375f4cd78edbee7d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malware or engaging in phishing activities. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kawanmto.com/contents//files/famunij.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0cdcc3512---wefutubewivubuw.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/xiwerevefowomuruno.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/15132968845.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/83518397270.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/vabanu.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/609f39974acaa5094acfc0781d4085c8/pazepijarogosumixewi.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/72dd774bb76f8840c2443f8d60dceeb9/29466754196.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/69812881968.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/968ef105214e0a66e7aa8bef8d1ad7b9/bumosajetiwevapevamodap.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/gosidezevufit.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1d65ff7129eecfb39a39e3791fc0cf77/97737830618.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/4788653584.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/p48ajpbjibh537902d8pp956s1/64794106668.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/30217874958.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/89203788746.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b22f62bf1a3fed34e20c78ac4420bd5a/vidizuzaliwirur.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021043005190273499.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/wanimimuzogugok.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/bowagarosadilizuza.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/junorixuvawadaki.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7881c31032---66923427219.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/61654803299.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/xetekejaji.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d03ff9c5e47761a84cd5d0f7659a9414/napujiwizebunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=drawing+and+art+classes+near+mePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 10680 bytes
SHA-256: 7de74db44a77b4d229a746deb9c929f3071397e303ddf63e44637930820f2276
font_02_sfnt_off00011488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11488 17024 bytes
SHA-256: 2ba97759c43c018914dc499bb8605300102a9c875786b744aa4be6af47590063

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